Blind and shutter opener and fastener



UNITED STATES PATENT OFFTCE.

JABEZ F. LAWRENCE AND LUKE A. FARNSWORTH, OF CLAREMONT, NE\V HAMPSHIRE.

BLIND AND SHUTTER OPENER AND FASTENER.

Specication of Letters Patent No. 7,246, dated April 2, 1850.

To all whom, t may concern Be it known that we, JABEZ F. LAWRENCE `beinghad to the accompanying drawings7 making a part of this specification.

Figure l, is a vertical section through a window frame Gr, showing anedge View of the window blindA H, thrown open, and the opening andclosing apparatus as seen be yond.. Fig. 2, is a vertical sectionshowing one side of the window frame and a portion of the blind placedtherein, and also the opening and closing apparatus as seen from theoutside; and Fig. 3, is a side elevation of the opening and closingapparatus.v

Similar letters indicate like parts in all the figures.

Our opening, closing, and retaining apparatus is constructed as follows:A shank a, passes through the side of the window casing, having a knob Aon its inner end, and the opener B, on its outer end; the opener B, is ablock of metal of the shape represented in the drawings; to win-smalland circular at the center, and gradually enlarging therefrom into theform of scrolls at each extremity placed in reversed positions; into thesurface of which is cut a groove f, running spirally from the extremityof one of the scroll like terminations of B, to the otherV-as shown inthe drawings.

C is a strong arm secured to and projecting from the outer side of thewindow frame- D is a lever secured to the window blind and connected tothe arm C by means of the fulcrum pin i, as shown in Figs. l and 3; theshort end e, of the lever D, is of such a shape as to fit accuratelyinto the groove f, in the opener B. The opener B is of such a shape thatas it is turned the short end e, of the lever D, will work freely in thegroove f, from one end to the other, and thereby turn the lever upon itsfulcrurn and the blind upon its hinges. Consequently, by taking hold ofthe knob A, and turning it, the blind may be opened and closed atpleasure. When the blind is open or closed, it cannot be moved withoutturning the -opener B, and consequently the apparatus not only serves toaid in opening and closing the blind from the inside of the house, butalso to retain'the blind when it is open or closed.

The apparatus is also of such a form that it can be almost entirelycovered by a protecting casing J, as represented in Fig. 4.

What we claim as our invention and desire to secure by Letters Patent,is-

The opening and closing of window blinds and retaining them when open orclosed,.by means of the rotary opener B, (which is circular at itscenter and gradually enlarges into scroll shaped extremities, having agroove f, in its surface extending spirally from one of itsscroll-shaped terminations to the other,) combined with the arm C,secured to the window casing, and the lever D, made fast to the blind,substan tially in the manner herein set forth.

-The above specification signed and wit nessed this twenty-irst day ofFebruary, 1850.

JABEZ F. LAWRENCE. LUKE A. FARNSWORTH.

Witnesses:

GEO. W. BLODGETT, H. S. ARMSTRONG.

